Question about Kyocera FS-920 Laser Printer

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Missing developer unit

Computer displays message "missing developer unit"

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Generally this printer can be separate into 4 major part: Printer body, Toner container, Developer unit and Drum unit. The developer unit is the unit where the toner container "mount" on it and it should be removed to allow cleaning task every time the toner container is replaced.
U may get this error message if the developer unit is not install properly after u replace a new toner container. Just lift the developer unit together with the toner container out of the printer and then insert back properly into the machine.

YBC (/\)

Posted on Oct 02, 2009

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ybchuan
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SOURCE: missing developer unit

Generally this printer can be separate into 4 major part: Printer body, Toner container, Developer unit and Drum unit. The developer unit is the unit where the toner container "mount" on it and it should be removed to allow cleaning task every time the toner container is replaced.
U may get this error message if the developer unit is not install properly after u replace a new toner container. Just lift the developer unit together with the toner container out of the printer and then insert back properly into the machine.

YBC (/\)

Posted on Oct 02, 2009

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How do i fix problem Add Toner


The Ricoh has toner and developer. When the developer is depleted it can not get to the right density when toner is added so the machine keeps saying to add toner. You need to clean out the developer unit and put in new developer. Depending upon your model you may need to install a drum and blade too. Ricoh technicians are trained to dissemble the unit and just replace the parts needed instead of getting a whole drum/developer unit. If you live in Southeast Florida Advanced business computers is a great source for help. Computer network repair, printer and copier maintenance repairs, leasing and supplies.

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The printer continues in Self Test, the printer is stuck at this point as it tries to continue to cycle through the power up.


Try to power on the printer without the toner kit and the waste toner box. If the printer stacks again at self test. Next step.... remove one part at time and check if the printer displays any message. First remove the developer unit and power on the machine (normal message "Missing Developer Unit"). Then pull out the fuser unit and power on the machine (normal message "Close Rear Cover"). And finally, remove the Drum Unit and power on the printer (normal message "Call Service 7410").
If the printer still stacks at Self Test, then that is not a good sign. Try to upgrade the printer' s firmware (system + engine). There is a possibility to go further from Self Test.
If it does not, then you have to replace the main pwb.

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Error on display call service 7402:0005942


The machine is not detecting the cyan developer unit . I would first try reseating the unit or replacing it.

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How can i settle the problem of magenta developer finishing so fast. Magenter developer for Konica Minolta Bizhub C550 is getting finished so fast.


If the message Change Imaging Unit Magenta displayed refer to imaging unit with contents a developer.The Imaging unit life is 80.000 copies.
The imaging units located after front door when is located the waste toner box.
If the message M toner end/change the M toner displayed refer to toner cartridge
The toner cartridge life 15.000 copies 5% saturation.In full color mode the color saturation is 80% and the color toner life is 6.000-8.000 copies.
I think your problems is a toner not the developer.

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CH steady means cover is open. Close either front or right cover well.
CH blinking means developer unit or toner cartridge not installed. Remove and return well and firmly.

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1 Answer

KONICA 1015 COPIER - P.27 ERROR MESSAGE - - WHAT DOES IT MEAN?


2. Toner was added prior to adding developer and performing the TDS adjustment. Developer must be added FIRST at new machine set-up so that toner does not fall on the uncovered TDS sensor.
Run 47 mode, output code 51 until the code does not reoccur (may take 5 to 10 attempts) OR open the developer unit and clean the excess toner from the area of the TDS sensor. Then tilt the developer unit to allow fresh developer into this area.

3. Poor connection at CN95. The toner density sensor (TDS) is abnormal (0.2 V DC or lower). Reconnect CN95 (located under the front of the developer unit).

4. TDS failure. If version 16.0 is installed, P27 is displayed when the TDS is disconnected or fails. Check for proper connection prior to replacing the TDS.

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1 Answer

Missing developer unit


Generally this printer can be separate into 4 major part: Printer body, Toner container, Developer unit and Drum unit. The developer unit is the unit where the toner container "mount" on it and it should be removed to allow cleaning task every time the toner container is replaced.
U may get this error message if the developer unit is not install properly after u replace a new toner container. Just lift the developer unit together with the toner container out of the printer and then insert back properly into the machine.

YBC (/\)

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Empty waste toner in transfer unit on the right side door.

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the density senson isn't work, it's inside of developer unit

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